William Howard Taft served as the 27th president of the United States from 1909 to 1913 and the tenth chief justice of the United States from 1921 to 1930. He is the only person to have held both offices.
Taft was born in Cincinnati, Ohio. His father, Alphonso Taft, was a U.S. attorney general and secretary of war. Taft attended Yale and joined Skull and Bones, of which his father was a founding member. After becoming a lawyer, Taft was appointed a judge while still in his twenties. From Wikipedia
